Nozzle-head for the artificial silk stretch-spinning process



Jan. 9, 1934. w. ZUR LOWEN 1,942,632

NOZZLE HEAD FOR THE ARTIFICIAL SILK STRETCH-SPINNING PROCESS Filed July3, 1931 Patented Jan. 9, 1934 UNITED STATES PATENT OFFICE NOZZLE-HEADFQR THE ARTIFICIAL SILK STRETCH-SPENNING PROCESS Delaware ApplicationJuly 3, 1931, Serial No. 548,687, and in Germany July 26, 1930 2 Claims.

This invention relates to an improved construction of a nozzle head forthe artificial silk stretch-spinning process.

In the known stretch-spinning devices the spinnerette is directlyattached to the so-called nozzle head which carries the supply pipe forthe solution to be spun and a stop-cock and at the same time serves asthe upper or rear closure member for the spinning vessel. The supplypipe is usually widened to a flow-chamber just before the spinnerette soas to supply the spinning solution to the spinnerette in a uniformcurrent. The spinnerette provided with a flanged-over margin is firmlymounted on the end of the nozzle head.

At the places where it comes into contact with the outer air thespinning solution has the property of hardening owing to evaporation ofthe solvent. If the spinning devices are stopped, adhering, encrustedlayers of hardened spinning solution are formed where the spinningsolution comes into contact with th air and, therefore, moreparticularly at the spinnerette. These layers are the more extensive thegreater the surface of contact between the spinning solution and theair. Since these layers do not dissolve up again without furthertreatment they must first of all be removed when setting the apparatusinto operation, since otherwise the solid portions are carried along bythe freshly flowing solution and, by stopping up the orifices of thespinnerette, render the spinning process liable to interruptions or evenquite impossible, and then the spinnerette has to be rinsed severaltimes with the spinning solution issuing from the supply pipe so as toensure removal of the last remnants of the hardened spinning solution.This cleansing operation is bothersome and consumes much time owing tothe large number of spinnerettes usually used; further, it entailsconsiderable losses in spinning solution, since this is used for therinsing. In addition, there is the danger that even when the nozzle headhas been carefully cleaned coagulated solution remains behind andimpairs the spinning operation.

In contradistinction to the foregoing, the nozzle head according to thepresent invention consists of two parts which are screwed together, thelower of said parts, i. e., the front portion, constructed as aspinnerette holder, holding the spinnerette, and the upper or rear parthaving .a narrow bore.

In this manner it is ensured that, when the spinnerette is changed, thespinning solution issuing from the narrow bore offers only a smallsurface to the outer air and consequently onlya little spinning solutioncan harden, which hardened solution can be removed in a simple manner bystripping off, but, besides this, no impairing eifect is exerted sinceany films that may still be present, owing to their small size, areforced through the holes which, in the stretch-spinning process, arealways quite wide. If, as a matter of fact, on any occasion it shouldhappen that a film cannot be penetrated and as a result a hole isstopped up, this is immaterial when the large number of holes is bornein mind, the titre still being maintained.

It is particularly advantageous to connect the portion serving asspinnerette holder to the supply lead only by a narrow bore. In this wayit is ensured that the sealing surface between the upper or rear nozzleportion and the spinnerette holder is not moistened by the spinningsolution, as a result of which the formation of film is still furtherdiminished.

The arrangement of the special spinnerette holder enables the flowchamber for the nozzle to be arranged in the spinnerette holder. It isjust this widening which, owing to the residual solution remainingbehind, most readily leads to contamination of the spinning solution andmust, therefore, be carefully cleaned. Hitherto this could only becarried out with the necessary care with difiiculty, since it had to beeffected on the machine itself.

In contradistinction thereto, the spinnerette holder according to theinvention can be cleaned in the simplest possible manner afterunscrewing by treatment with suitable solvents. Finally, since thecleaning can be carried out not on the spinning machine but apart fromthis while in storage, the spinning machines are, as a result, betterutilized since the time necessary for cleaning is dispensed with. It isonly necessary to screw the already cleaned spinnerette holder on to thenozzle head after the contaminated spinnerette holder, or a specialclosure cap provided for when the machine is not in operation, has beenremoved.

The accompanying drawing shows one constructional form of the nozzlehead according to the invention by way of example.

Figure 1 shows in elevation a nozzle head having a screwed-onspinnerette holder.

Figure 2 shows a section along the line A B of Figure 1.

The nozzle head consists of an upper or rear so I portion 3 attached tothe spinning machine and the nozzle holder 10 capable of being screwedthereon. The upper or rear portion 3 is provided with a bore 1 forconducting the spinning solution to the nozzle, and a conical bore 5vertical thereto for accommodating the stop cock 2. The lower end 6 ofthe portion 3 of the nozzle is made of chemically resistant material, e.g. of non-rusting steel. By this means rusting to,- gether of thespinnerette holder with the nozzle head at the connecting placesQwithconsequent difiiculty in subsequent separation, is avoided. v 4 The bore4 leading from the stop cock 2 to the nozzle 7 is made specially-narroworder to diminish the hardening of the spinning solution at the point ofexit to a minimum. Consequently, it would suflice to makethebor'e'itself wide and to make only the orifice narrow.

The spinnerette '7 provided with flanged-over edge 8 is firmly drawn onto the spinnerette holder 10-, so that'a flow chamber 12 is formed whichis closed-in on *all sidesl The spinnerette holder 10' issc'rew'ed'ontoth'e' nozzle head 3 and at" the same'tirne"abuts tightly againsttheseal-- i'r'ig surface'13 thus"prevnting entrance of spinning"s'oluti'onwhich 'can pass through the'bore chamber 12.

11 of the spinnerette holder 10 into the fiow The spinnerette holder 10is provided with nose members 9 for the purpose of firmly drawing on thesame by means of a key.

NVhat I claim is: i r

1. In combination a nozzle head for extruding artificial products,comprising, a unit for supplying the solution to be extruded, a unitdetachably secured to said first unit, said second unit comprising adisc perforated to form the artificial-products, and a third unit whichmay be -substituted for said second unit to stop the flow of thesolution when said second unit is removed. a

2..A nozzle-head for a stretch-spinning apparatus comprising, incombination, an upper orrear portion provided with a narrow supply duct,a spinnerette holder adapted to be screwed thereon, said holder beingconnected to the supplymduct through a narrow bore, the abuttingsurfaces of the upper or rear portion and the spinnerette holder beingin- 'such tight'contact that thepa'ssage of spinning-solutionis-prevented, and a spinneretteprovided 'with perforations. i

" WALDEMAR mm LowEN.

